Microbiology of Soils
Most soil protozoa are flagellates or amoebas, having their dominant mode of nitrogen as

ingestion of fungi
all of these
ingestion of bacteria
ingestion of mold

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Microbiology of Soils
Syntrophism involves

exchange of nutrients between two species
no exchange of nutrients among species
exchange of nutrients among species
no exchange of nutrients between two species

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Microbiology of Soils
Nitrogen fixation by the microorganisms can be detected by adopting the approach of

demonstrating growth in a nitrogen free medium
cultivating the microorganisms in the presence of nitrogen labeled with isotropic nitrogen
measuring15N2 by mass spectrometer
All of these

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